How
to add flash (the effect, not the animation or game!) to your photos...

Bring in the photo using the
clipboard, or drag it into the main window, the select Star Flash as the
effect to apply. You can then fine tune it, (click on the Fine Tune...
button) and you will get this dialog box with sliders and an image preview
area:

You can choose all sorts of
things with this dialog box, the position of the flash (click inside the
preview to do this), the colors and number of spikes, the angle and shape,
everything in fact! Some more examples illustrate this: